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   1 /***************************************************************************
   2  *   Copyright (C) 2009 by Simon Qian <SimonQian@SimonQian.com>            *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  18  ***************************************************************************/
  19
  20 /* Versaloon is a programming tool for multiple MCUs.
  21  * OpenOCD and MSP430 supports are distributed under GPLv2.
  22  * You can find it at http://www.SimonQian.com/en/Versaloon.
  23  */
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include "config.h"
  27 #endif
  28
  29 #include "interface.h"
  30 #include "commands.h"
  31 #include "usb_common.h"
  32
  33 //#define _VSLLINK_IN_DEBUG_MODE_
  34
  35 #define VSLLINK_MODE_NORMAL                     0
  36 #define VSLLINK_MODE_DMA                        1
  37
  38 static uint16_t vsllink_usb_vid;
  39 static uint16_t vsllink_usb_pid;
  40 static uint8_t vsllink_usb_bulkout;
  41 static uint8_t vsllink_usb_bulkin;
  42 static uint8_t vsllink_usb_interface;
  43 static uint8_t vsllink_mode = VSLLINK_MODE_NORMAL;
  44 static int VSLLINK_USB_TIMEOUT = 10000;
  45
  46 static int VSLLINK_BufferSize = 1024;
  47
  48 /* Global USB buffers */
  49 static int vsllink_usb_out_buffer_idx;
  50 static int vsllink_usb_in_want_length;
  51 static uint8_t* vsllink_usb_in_buffer = NULL;
  52 static uint8_t* vsllink_usb_out_buffer = NULL;
  53
  54 /* Constants for VSLLink command */
  55 #define VSLLINK_CMD_CONN                        0x80
  56 #define VSLLINK_CMD_DISCONN                     0x81
  57 #define VSLLINK_CMD_SET_SPEED           0x82
  58 #define VSLLINK_CMD_SET_PORT            0x90
  59 #define VSLLINK_CMD_GET_PORT            0x91
  60 #define VSLLINK_CMD_SET_PORTDIR         0x92
  61 #define VSLLINK_CMD_HW_JTAGSEQCMD       0xA0
  62 #define VSLLINK_CMD_HW_JTAGHLCMD        0xA1
  63 #define VSLLINK_CMD_HW_SWDCMD           0xA2
  64 #define VSLLINK_CMD_HW_JTAGRAWCMD       0xA3
  65
  66 #define VSLLINK_CMDJTAGSEQ_TMSBYTE      0x00
  67 #define VSLLINK_CMDJTAGSEQ_TMSCLOCK     0x40
  68 #define VSLLINK_CMDJTAGSEQ_SCAN         0x80
  69
  70 #define VSLLINK_CMDJTAGSEQ_CMDMSK       0xC0
  71 #define VSLLINK_CMDJTAGSEQ_LENMSK       0x3F
  72
  73 #define JTAG_PINMSK_SRST                        (1 << 0)
  74 #define JTAG_PINMSK_TRST                        (1 << 1)
  75 #define JTAG_PINMSK_USR1                        (1 << 2)
  76 #define JTAG_PINMSK_USR2                        (1 << 3)
  77 #define JTAG_PINMSK_TCK                         (1 << 4)
  78 #define JTAG_PINMSK_TMS                         (1 << 5)
  79 #define JTAG_PINMSK_TDI                         (1 << 6)
  80 #define JTAG_PINMSK_TDO                         (1 << 7)
  81
  82
  83 #define VSLLINK_TAP_MOVE(from, to)      VSLLINK_tap_move[tap_move_ndx(from)][tap_move_ndx(to)]
  84
  85 /* VSLLINK_tap_move[i][j]: tap movement command to go from state i to state j
  86  * 0: Test-Logic-Reset
  87  * 1: Run-Test/Idle
  88  * 2: Shift-DR
  89  * 3: Pause-DR
  90  * 4: Shift-IR
  91  * 5: Pause-IR
  92  *
  93  * SD->SD and SI->SI have to be caught in interface specific code
  94  */
  95 static uint8_t VSLLINK_tap_move[6][6] =
  96 {
  97 /*        TLR   RTI   SD    PD    SI    PI             */
  98         {0xff, 0x7f, 0x2f, 0x0a, 0x37, 0x16},   /* TLR */
  99         {0xff, 0x00, 0x45, 0x05, 0x4b, 0x0b},   /* RTI */
 100         {0xff, 0x61, 0x00, 0x01, 0x0f, 0x2f},   /* SD  */
 101         {0xfe, 0x60, 0x40, 0x5c, 0x3c, 0x5e},   /* PD  */
 102         {0xff, 0x61, 0x07, 0x17, 0x00, 0x01},   /* SI  */
 103         {0xfe, 0x60, 0x38, 0x5c, 0x40, 0x5e}    /* PI  */
 104 };
 105
 106 struct insert_insignificant_operation {
 107         unsigned char insert_value;
 108         unsigned char insert_position;
 109 };
 110
 111 static struct insert_insignificant_operation VSLLINK_TAP_MOVE_INSERT_INSIGNIFICANT[6][6] =
 112 {
 113 /*       stuff  offset   */
 114         {/*     TLR     */
 115         {1,             0,},    /* TLR */
 116         {1,             0,},    /* RTI */
 117         {1,             0,},    /* SD  */
 118         {1,             0,},    /* PD  */
 119         {1,             0,},    /* SI  */
 120         {1,             0,}},   /* PI  */
 121         {/*     RTI     */
 122         {1,             0,},    /* TLR */
 123         {0,             0,},    /* RTI */
 124         {0,             4,},    /* SD  */
 125         {0,             7,},    /* PD  */
 126         {0,             5,},    /* SI  */
 127         {0,             7,}},   /* PI  */
 128         {/*     SD      */
 129         {0,             0,},    /* TLR */
 130         {0,             0,},    /* RTI */
 131         {0,             0,},    /* SD  */
 132         {0,             0,},    /* PD  */
 133         {0,             0,},    /* SI  */
 134         {0,             0,}},   /* PI  */
 135         {/*     PD      */
 136         {0,             0,},    /* TLR */
 137         {0,             0,},    /* RTI */
 138         {0,             0,},    /* SD  */
 139         {0,             0,},    /* PD  */
 140         {0,             0,},    /* SI  */
 141         {0,             0,}},   /* PI  */
 142         {/*     SI      */
 143         {0,             0,},    /* TLR */
 144         {0,             0,},    /* RTI */
 145         {0,             0,},    /* SD  */
 146         {0,             0,},    /* PD  */
 147         {0,             0,},    /* SI  */
 148         {0,             0,}},   /* PI  */
 149         {/*     PI      */
 150         {0,             0,},    /* TLR */
 151         {0,             0,},    /* RTI */
 152         {0,             0,},    /* SD  */
 153         {0,             0,},    /* PD  */
 154         {0,             0,},    /* SI  */
 155         {0,             0,}},   /* PI  */
 156 };
 157
 158 static uint8_t VSLLINK_BIT_MSK[8] =
 159 {
 160         0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f
 161 };
 162
 163 struct pending_scan_result {
 164         int offset;
 165         int length; /* Number of bits to read */
 166         struct scan_command *command; /* Corresponding scan command */
 167         uint8_t *buffer;
 168 };
 169
 170 #define MAX_PENDING_SCAN_RESULTS 256
 171
 172 static int pending_scan_results_length;
 173 static struct pending_scan_result pending_scan_results_buffer[MAX_PENDING_SCAN_RESULTS];
 174
 175 /* Queue command functions */
 176 static void vsllink_end_state(tap_state_t state);
 177 static void vsllink_state_move_dma(void);
 178 static void vsllink_state_move_normal(void);
 179 static void (*vsllink_state_move)(void);
 180 static void vsllink_path_move_dma(int num_states, tap_state_t *path);
 181 static void vsllink_path_move_normal(int num_states, tap_state_t *path);
 182 static void (*vsllink_path_move)(int num_states, tap_state_t *path);
 183 static void vsllink_runtest(int num_cycles);
 184 static void vsllink_stableclocks_dma(int num_cycles, int tms);
 185 static void vsllink_stableclocks_normal(int num_cycles, int tms);
 186 static void (*vsllink_stableclocks)(int num_cycles, int tms);
 187 static void vsllink_scan_dma(bool ir_scan, enum scan_type type, uint8_t *buffer, int scan_size, struct scan_command *command);
 188 static void vsllink_scan_normal(bool ir_scan, enum scan_type type, uint8_t *buffer, int scan_size, struct scan_command *command);
 189 static void (*vsllink_scan)(bool ir_scan, enum scan_type type, uint8_t *buffer, int scan_size, struct scan_command *command);
 190 static void vsllink_reset(int trst, int srst);
 191 static void vsllink_simple_command(uint8_t command);
 192 static int vsllink_connect(void);
 193 static int vsllink_disconnect(void);
 194
 195 /* VSLLink tap buffer functions */
 196 static void vsllink_tap_append_step(int tms, int tdi);
 197 static void vsllink_tap_init_dma(void);
 198 static void vsllink_tap_init_normal(void);
 199 static void (*vsllink_tap_init)(void);
 200 static int vsllink_tap_execute_dma(void);
 201 static int vsllink_tap_execute_normal(void);
 202 static int (*vsllink_tap_execute)(void);
 203 static void vsllink_tap_ensure_space_dma(int scans, int length);
 204 static void vsllink_tap_ensure_space_normal(int scans, int length);
 205 static void (*vsllink_tap_ensure_space)(int scans, int length);
 206 static void vsllink_tap_append_scan_dma(int length, uint8_t *buffer, struct scan_command *command);
 207 static void vsllink_tap_append_scan_normal(int length, uint8_t *buffer, struct scan_command *command, int offset);
 208
 209 /* VSLLink lowlevel functions */
 210 struct vsllink {
 211         struct usb_dev_handle* usb_handle;
 212 };
 213
 214 static struct vsllink *vsllink_usb_open(void);
 215 static void vsllink_usb_close(struct vsllink *vsllink);
 216 static int vsllink_usb_message(struct vsllink *vsllink, int out_length, int in_length);
 217 static int vsllink_usb_write(struct vsllink *vsllink, int out_length);
 218 static int vsllink_usb_read(struct vsllink *vsllink);
 219
 220 #if defined _DEBUG_USB_COMMS_ || defined _DEBUG_JTAG_IO_
 221 static void vsllink_debug_buffer(uint8_t *buffer, int length);
 222 #endif
 223
 224 static int vsllink_tms_data_len = 0;
 225 static uint8_t* vsllink_tms_cmd_pos;
 226
 227 static int tap_length = 0;
 228 static int tap_buffer_size = 0;
 229 static uint8_t *tms_buffer = NULL;
 230 static uint8_t *tdi_buffer = NULL;
 231 static uint8_t *tdo_buffer = NULL;
 232 static int last_tms;
 233
 234 static struct vsllink* vsllink_handle = NULL;
 235
 236 static void reset_command_pointer(void)
 237 {
 238         if (vsllink_mode == VSLLINK_MODE_NORMAL)
 239         {
 240                 vsllink_usb_out_buffer[0] = VSLLINK_CMD_HW_JTAGSEQCMD;
 241                 vsllink_usb_out_buffer_idx = 3;
 242         }
 243         else
 244         {
 245                 tap_length = 0;
 246         }
 247 }
 248
 249 static int vsllink_execute_queue(void)
 250 {
 251         struct jtag_command *cmd = jtag_command_queue;
 252         int scan_size;
 253         enum scan_type type;
 254         uint8_t *buffer;
 255
 256         DEBUG_JTAG_IO("--------------------------------- vsllink -------------------------------------");
 257
 258         reset_command_pointer();
 259         while (cmd != NULL)
 260         {
 261                 switch (cmd->type)
 262                 {
 263                         case JTAG_RUNTEST:
 264                                 DEBUG_JTAG_IO("runtest %i cycles, end in %s", cmd->cmd.runtest->num_cycles, \
 265                                         tap_state_name(cmd->cmd.runtest->end_state));
 266
 267                                 vsllink_end_state(cmd->cmd.runtest->end_state);
 268                                 vsllink_runtest(cmd->cmd.runtest->num_cycles);
 269                                 break;
 270
 271                         case JTAG_STATEMOVE:
 272                                 DEBUG_JTAG_IO("statemove end in %s", tap_state_name(cmd->cmd.statemove->end_state));
 273
 274                                 vsllink_end_state(cmd->cmd.statemove->end_state);
 275                                 vsllink_state_move();
 276                                 break;
 277
 278                         case JTAG_PATHMOVE:
 279                                 DEBUG_JTAG_IO("pathmove: %i states, end in %s", \
 280                                         cmd->cmd.pathmove->num_states, \
 281                                         tap_state_name(cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]));
 282
 283                                 vsllink_path_move(cmd->cmd.pathmove->num_states, cmd->cmd.pathmove->path);
 284                                 break;
 285
 286                         case JTAG_SCAN:
 287                                 vsllink_end_state(cmd->cmd.scan->end_state);
 288
 289                                 scan_size = jtag_build_buffer(cmd->cmd.scan, &buffer);
 290                                 if (cmd->cmd.scan->ir_scan)
 291                                 {
 292                                         DEBUG_JTAG_IO("JTAG Scan write IR(%d bits), end in %s:", scan_size, tap_state_name(cmd->cmd.scan->end_state));
 293                                 }
 294                                 else
 295                                 {
 296                                         DEBUG_JTAG_IO("JTAG Scan write DR(%d bits), end in %s:", scan_size, tap_state_name(cmd->cmd.scan->end_state));
 297                                 }
 298
 299 #ifdef _DEBUG_JTAG_IO_
 300                                 vsllink_debug_buffer(buffer, (scan_size + 7) >> 3);
 301 #endif
 302
 303                                 type = jtag_scan_type(cmd->cmd.scan);
 304
 305                                 vsllink_scan(cmd->cmd.scan->ir_scan, type, buffer, scan_size, cmd->cmd.scan);
 306                                 break;
 307
 308                         case JTAG_RESET:
 309                                 DEBUG_JTAG_IO("reset trst: %i srst %i", cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 310
 311                                 vsllink_tap_execute();
 312
 313                                 if (cmd->cmd.reset->trst == 1)
 314                                 {
 315                                         tap_set_state(TAP_RESET);
 316                                 }
 317                                 vsllink_reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 318                                 break;
 319
 320                         case JTAG_SLEEP:
 321                                 DEBUG_JTAG_IO("sleep %i", cmd->cmd.sleep->us);
 322                                 vsllink_tap_execute();
 323                                 jtag_sleep(cmd->cmd.sleep->us);
 324                                 break;
 325
 326                         case JTAG_STABLECLOCKS:
 327                                 DEBUG_JTAG_IO("add %d clocks", cmd->cmd.stableclocks->num_cycles);
 328                                 switch (tap_get_state())
 329                                 {
 330                                 case TAP_RESET:
 331                                         // tms should be '1' to stay in TAP_RESET mode
 332                                         scan_size = 1;
 333                                         break;
 334                                 case TAP_DRSHIFT:
 335                                 case TAP_IDLE:
 336                                 case TAP_DRPAUSE:
 337                                 case TAP_IRSHIFT:
 338                                 case TAP_IRPAUSE:
 339                                         // in other mode, tms should be '0'
 340                                         scan_size = 0;
 341                                         break;                  /* above stable states are OK */
 342                                 default:
 343                                          LOG_ERROR("jtag_add_clocks() was called with TAP in non-stable state \"%s\"",
 344                                                          tap_state_name(tap_get_state()));
 345                                          exit(-1);
 346                                 }
 347                                 vsllink_stableclocks(cmd->cmd.stableclocks->num_cycles, scan_size);
 348                                 break;
 349
 350                         default:
 351                                 LOG_ERROR("BUG: unknown JTAG command type encountered: %d", cmd->type);
 352                                 exit(-1);
 353                 }
 354                 cmd = cmd->next;
 355         }
 356
 357         return vsllink_tap_execute();
 358 }
 359
 360 static int vsllink_speed(int speed)
 361 {
 362         int result;
 363
 364         vsllink_usb_out_buffer[0] = VSLLINK_CMD_SET_SPEED;
 365         vsllink_usb_out_buffer[1] = (speed >> 0) & 0xff;
 366         vsllink_usb_out_buffer[2] = (speed >> 8) & 0xFF;
 367
 368         result = vsllink_usb_write(vsllink_handle, 3);
 369
 370         if (result == 3)
 371         {
 372                 return ERROR_OK;
 373         }
 374         else
 375         {
 376                 LOG_ERROR("VSLLink setting speed failed (%d)", result);
 377                 return ERROR_JTAG_DEVICE_ERROR;
 378         }
 379
 380         return ERROR_OK;
 381 }
 382
 383 static int vsllink_khz(int khz, int *jtag_speed)
 384 {
 385         *jtag_speed = khz;
 386
 387         return ERROR_OK;
 388 }
 389
 390 static int vsllink_speed_div(int jtag_speed, int *khz)
 391 {
 392         *khz = jtag_speed;
 393
 394         return ERROR_OK;
 395 }
 396
 397 static int vsllink_init(void)
 398 {
 399         int check_cnt, to_tmp;
 400         int result;
 401         char version_str[100];
 402
 403         vsllink_usb_in_buffer = malloc(VSLLINK_BufferSize);
 404         vsllink_usb_out_buffer = malloc(VSLLINK_BufferSize);
 405         if ((vsllink_usb_in_buffer == NULL) || (vsllink_usb_out_buffer == NULL))
 406         {
 407                 LOG_ERROR("Not enough memory");
 408                 exit(-1);
 409         }
 410
 411         vsllink_handle = vsllink_usb_open();
 412
 413         if (vsllink_handle == 0)
 414         {
 415                 LOG_ERROR("Can't find USB JTAG Interface! Please check connection and permissions.");
 416                 return ERROR_JTAG_INIT_FAILED;
 417         }
 418         LOG_DEBUG("vsllink found on %04X:%04X", vsllink_usb_vid, vsllink_usb_pid);
 419
 420         to_tmp = VSLLINK_USB_TIMEOUT;
 421         VSLLINK_USB_TIMEOUT = 100;
 422         check_cnt = 0;
 423         while (check_cnt < 5)
 424         {
 425                 vsllink_simple_command(0x00);
 426                 result = vsllink_usb_read(vsllink_handle);
 427
 428                 if (result > 2)
 429                 {
 430                         vsllink_usb_in_buffer[result] = 0;
 431                         VSLLINK_BufferSize = vsllink_usb_in_buffer[0] + (vsllink_usb_in_buffer[1] << 8);
 432                         strncpy(version_str, (char *)vsllink_usb_in_buffer + 2, sizeof(version_str));
 433                         LOG_INFO("%s", version_str);
 434
 435                         // free the pre-alloc memroy
 436                         free(vsllink_usb_in_buffer);
 437                         free(vsllink_usb_out_buffer);
 438                         vsllink_usb_in_buffer = NULL;
 439                         vsllink_usb_out_buffer = NULL;
 440
 441                         // alloc new memory
 442                         vsllink_usb_in_buffer = malloc(VSLLINK_BufferSize);
 443                         vsllink_usb_out_buffer = malloc(VSLLINK_BufferSize);
 444                         if ((vsllink_usb_in_buffer == NULL) || (vsllink_usb_out_buffer == NULL))
 445                         {
 446                                 LOG_ERROR("Not enough memory");
 447                                 exit(-1);
 448                         }
 449                         else
 450                         {
 451                                 LOG_INFO("buffer size for USB is %d bytes", VSLLINK_BufferSize);
 452                         }
 453                         // alloc memory for dma mode
 454                         if (vsllink_mode == VSLLINK_MODE_DMA)
 455                         {
 456                                 tap_buffer_size = (VSLLINK_BufferSize - 3) / 2;
 457                                 tms_buffer = (uint8_t*)malloc(tap_buffer_size);
 458                                 tdi_buffer = (uint8_t*)malloc(tap_buffer_size);
 459                                 tdo_buffer = (uint8_t*)malloc(tap_buffer_size);
 460                                 if ((tms_buffer == NULL) || (tdi_buffer == NULL) || (tdo_buffer == NULL))
 461                                 {
 462                                         LOG_ERROR("Not enough memory");
 463                                         exit(-1);
 464                                 }
 465                         }
 466                         break;
 467                 }
 468                 vsllink_simple_command(VSLLINK_CMD_DISCONN);
 469                 check_cnt++;
 470         }
 471         if (check_cnt == 3)
 472         {
 473                 // It's dangerout to proced
 474                 LOG_ERROR("VSLLink initial failed");
 475                 exit(-1);
 476         }
 477         VSLLINK_USB_TIMEOUT = to_tmp;
 478
 479         // connect to vsllink
 480         vsllink_connect();
 481         // initialize function pointers
 482         if (vsllink_mode == VSLLINK_MODE_NORMAL)
 483         {
 484                 // normal mode
 485                 vsllink_state_move = vsllink_state_move_normal;
 486                 vsllink_path_move = vsllink_path_move_normal;
 487                 vsllink_stableclocks = vsllink_stableclocks_normal;
 488                 vsllink_scan = vsllink_scan_normal;
 489
 490                 vsllink_tap_init = vsllink_tap_init_normal;
 491                 vsllink_tap_execute = vsllink_tap_execute_normal;
 492                 vsllink_tap_ensure_space = vsllink_tap_ensure_space_normal;
 493
 494                 LOG_INFO("vsllink run in NORMAL mode");
 495         }
 496         else
 497         {
 498                 // dma mode
 499                 vsllink_state_move = vsllink_state_move_dma;
 500                 vsllink_path_move = vsllink_path_move_dma;
 501                 vsllink_stableclocks = vsllink_stableclocks_dma;
 502                 vsllink_scan = vsllink_scan_dma;
 503
 504                 vsllink_tap_init = vsllink_tap_init_dma;
 505                 vsllink_tap_execute = vsllink_tap_execute_dma;
 506                 vsllink_tap_ensure_space = vsllink_tap_ensure_space_dma;
 507
 508                 LOG_INFO("vsllink run in DMA mode");
 509         }
 510
 511         // Set SRST and TRST to output, Set USR1 and USR2 to input
 512         vsllink_usb_out_buffer[0] = VSLLINK_CMD_SET_PORTDIR;
 513         vsllink_usb_out_buffer[1] = JTAG_PINMSK_SRST | JTAG_PINMSK_TRST | JTAG_PINMSK_USR1 | JTAG_PINMSK_USR2;
 514         vsllink_usb_out_buffer[2] = JTAG_PINMSK_SRST | JTAG_PINMSK_TRST;
 515         if (vsllink_usb_write(vsllink_handle, 3) != 3)
 516         {
 517                 LOG_ERROR("VSLLink USB send data error");
 518                 exit(-1);
 519         }
 520
 521         vsllink_reset(0, 0);
 522
 523         LOG_INFO("VSLLink JTAG Interface ready");
 524
 525         vsllink_tap_init();
 526
 527         return ERROR_OK;
 528 }
 529
 530 static int vsllink_quit(void)
 531 {
 532         if ((vsllink_usb_in_buffer != NULL) && (vsllink_usb_out_buffer != NULL))
 533         {
 534                 // Set all pins to input
 535                 vsllink_usb_out_buffer[0] = VSLLINK_CMD_SET_PORTDIR;
 536                 vsllink_usb_out_buffer[1] = JTAG_PINMSK_SRST | JTAG_PINMSK_TRST | JTAG_PINMSK_USR1 | JTAG_PINMSK_USR2;
 537                 vsllink_usb_out_buffer[2] = 0;
 538                 if (vsllink_usb_write(vsllink_handle, 3) != 3)
 539                 {
 540                         LOG_ERROR("VSLLink USB send data error");
 541                         exit(-1);
 542                 }
 543
 544                 // disconnect
 545                 vsllink_disconnect();
 546                 vsllink_usb_close(vsllink_handle);
 547                 vsllink_handle = NULL;
 548         }
 549
 550         if (vsllink_usb_in_buffer != NULL)
 551         {
 552                 free(vsllink_usb_in_buffer);
 553                 vsllink_usb_in_buffer = NULL;
 554         }
 555         if (vsllink_usb_out_buffer != NULL)
 556         {
 557                 free(vsllink_usb_out_buffer);
 558                 vsllink_usb_out_buffer = NULL;
 559         }
 560
 561         return ERROR_OK;
 562 }
 563
 564 /***************************************************************************/
 565 /* Queue command implementations */
 566 static int vsllink_disconnect(void)
 567 {
 568         vsllink_simple_command(VSLLINK_CMD_DISCONN);
 569         return ERROR_OK;
 570 }
 571
 572 static int vsllink_connect(void)
 573 {
 574         char vsllink_str[100];
 575
 576         vsllink_usb_out_buffer[0] = VSLLINK_CMD_CONN;
 577         vsllink_usb_out_buffer[1] = vsllink_mode;
 578         vsllink_usb_message(vsllink_handle, 2, 0);
 579         if (vsllink_usb_read(vsllink_handle) > 2)
 580         {
 581                 strncpy(vsllink_str, (char *)vsllink_usb_in_buffer + 2, sizeof(vsllink_str));
 582                 LOG_INFO("%s", vsllink_str);
 583         }
 584
 585         return ERROR_OK;
 586 }
 587
 588 // when vsllink_tms_data_len > 0, vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] is the byte that need to be appended.
 589 // length of VSLLINK_CMDJTAGSEQ_TMSBYTE has been set, no need to set it here.
 590 static void vsllink_append_tms(void)
 591 {
 592         uint8_t tms_scan = VSLLINK_TAP_MOVE(tap_get_state(), tap_get_end_state());
 593         uint16_t tms2;
 594         struct insert_insignificant_operation *insert = \
 595                 &VSLLINK_TAP_MOVE_INSERT_INSIGNIFICANT[tap_move_ndx(tap_get_state())][tap_move_ndx(tap_get_end_state())];
 596
 597         if (((tap_get_state() != TAP_RESET) && (tap_get_state() != TAP_IDLE) && (tap_get_state() != TAP_DRPAUSE) && (tap_get_state() != TAP_IRPAUSE)) || \
 598                         (vsllink_tms_data_len <= 0) || (vsllink_tms_data_len >= 8) || \
 599                         (vsllink_tms_cmd_pos == NULL))
 600         {
 601                 LOG_ERROR("There MUST be some bugs in the driver");
 602                 exit(-1);
 603         }
 604
 605         tms2 = (tms_scan & VSLLINK_BIT_MSK[insert->insert_position]) << \
 606                                 vsllink_tms_data_len;
 607         if (insert->insert_value == 1)
 608         {
 609                 tms2 |= VSLLINK_BIT_MSK[8 - vsllink_tms_data_len] << \
 610                                 (vsllink_tms_data_len + insert->insert_position);
 611         }
 612         tms2 |= (tms_scan >> insert->insert_position) << \
 613                                 (8 + insert->insert_position);
 614
 615         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (tms2 >> 0) & 0xff;
 616         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tms2 >> 8) & 0xff;
 617
 618         vsllink_tms_data_len = 0;
 619         vsllink_tms_cmd_pos = NULL;
 620 }
 621
 622 static void vsllink_end_state(tap_state_t state)
 623 {
 624         if (tap_is_state_stable(state))
 625         {
 626                 tap_set_end_state(state);
 627         }
 628         else
 629         {
 630                 LOG_ERROR("BUG: %i is not a valid end state", state);
 631                 exit(-1);
 632         }
 633 }
 634
 635 /* Goes to the end state. */
 636 static void vsllink_state_move_normal(void)
 637 {
 638         if (vsllink_tms_data_len > 0)
 639         {
 640                 vsllink_append_tms();
 641         }
 642         else
 643         {
 644                 vsllink_tap_ensure_space(0, 2);
 645
 646                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE;
 647                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_TAP_MOVE(tap_get_state(), tap_get_end_state());
 648         }
 649
 650         tap_set_state(tap_get_end_state());
 651 }
 652 static void vsllink_state_move_dma(void)
 653 {
 654         int i, insert_length = (tap_length % 8) ? (8 - (tap_length % 8)) : 0;
 655         struct insert_insignificant_operation *insert = \
 656                 &VSLLINK_TAP_MOVE_INSERT_INSIGNIFICANT[tap_move_ndx(tap_get_state())][tap_move_ndx(tap_get_end_state())];
 657         uint8_t tms_scan = VSLLINK_TAP_MOVE(tap_get_state(), tap_get_end_state());
 658
 659         if (tap_get_state() == TAP_RESET)
 660         {
 661                 vsllink_tap_ensure_space(0, 8);
 662
 663                 for (i = 0; i < 8; i++)
 664                 {
 665                         vsllink_tap_append_step(1, 0);
 666                 }
 667         }
 668
 669         if (insert_length > 0)
 670         {
 671                 vsllink_tap_ensure_space(0, 16);
 672
 673                 for (i = 0; i < insert->insert_position; i++)
 674                 {
 675                         vsllink_tap_append_step((tms_scan >> i) & 1, 0);
 676                 }
 677                 for (i = 0; i < insert_length; i++)
 678                 {
 679                         vsllink_tap_append_step(insert->insert_value, 0);
 680                 }
 681                 for (i = insert->insert_position; i < 8; i++)
 682                 {
 683                         vsllink_tap_append_step((tms_scan >> i) & 1, 0);
 684                 }
 685         }
 686         else
 687         {
 688                 vsllink_tap_ensure_space(0, 8);
 689
 690                 for (i = 0; i < 8; i++)
 691                 {
 692                         vsllink_tap_append_step((tms_scan >> i) & 1, 0);
 693                 }
 694         }
 695
 696         tap_set_state(tap_get_end_state());
 697 }
 698
 699 // write tms from current vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx]
 700 static void vsllink_add_path(int start, int num, tap_state_t *path)
 701 {
 702         int i;
 703
 704         for (i = start; i < (start + num); i++)
 705         {
 706                 if ((i & 7) == 0)
 707                 {
 708                         if (i > 0)
 709                         {
 710                                 vsllink_usb_out_buffer_idx++;
 711                         }
 712                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = 0;
 713                 }
 714
 715                 if (path[i - start] == tap_state_transition(tap_get_state(), true))
 716                 {
 717                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] |= 1 << (i & 7);
 718                 }
 719                 else if (path[i - start] == tap_state_transition(tap_get_state(), false))
 720                 {
 721                         // nothing to do
 722                 }
 723                 else
 724                 {
 725                         LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_name(tap_get_state()), tap_state_name(path[i]));
 726                         exit(-1);
 727                 }
 728                 tap_set_state(path[i - start]);
 729         }
 730         if ((i > 0) && ((i & 7) == 0))
 731         {
 732                 vsllink_usb_out_buffer_idx++;
 733                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = 0;
 734         }
 735
 736         tap_set_end_state(tap_get_state());
 737 }
 738
 739 static void vsllink_path_move_normal(int num_states, tap_state_t *path)
 740 {
 741         int i, tms_len, tms_cmd_pos, path_idx = 0;
 742
 743         if (vsllink_tms_data_len > 0)
 744         {
 745                 // there are vsllink_tms_data_len more tms bits to be shifted
 746                 // so there are vsllink_tms_data_len + num_states tms bits in all
 747                 tms_len = vsllink_tms_data_len + num_states;
 748                 if (tms_len <= 16)
 749                 {
 750                         // merge into last tms shift
 751                         if (tms_len < 8)
 752                         {
 753                                 // just append tms data to the last tms byte
 754                                 vsllink_add_path(vsllink_tms_data_len, num_states, path);
 755                         }
 756                         else if (tms_len == 8)
 757                         {
 758                                 // end last tms shift command
 759                                 (*vsllink_tms_cmd_pos)--;
 760                                 vsllink_add_path(vsllink_tms_data_len, num_states, path);
 761                         }
 762                         else if (tms_len < 16)
 763                         {
 764                                 if ((*vsllink_tms_cmd_pos & VSLLINK_CMDJTAGSEQ_LENMSK) < VSLLINK_CMDJTAGSEQ_LENMSK)
 765                                 {
 766                                         // every tms shift command can contain VSLLINK_CMDJTAGSEQ_LENMSK + 1 bytes in most
 767                                         // there is enought tms length in the current tms shift command
 768                                         (*vsllink_tms_cmd_pos)++;
 769                                         vsllink_add_path(vsllink_tms_data_len, num_states, path);
 770                                 }
 771                                 else
 772                                 {
 773                                         // every tms shift command can contain VSLLINK_CMDJTAGSEQ_LENMSK + 1 bytes in most
 774                                         // not enough tms length in the current tms shift command
 775                                         // so a new command should be added
 776                                         // first decrease byte length of last tms shift command
 777                                         (*vsllink_tms_cmd_pos)--;
 778                                         // append tms data to the last tms byte
 779                                         vsllink_add_path(vsllink_tms_data_len, 8 - vsllink_tms_data_len, path);
 780                                         path += 8 - vsllink_tms_data_len;
 781                                         // add new command(3 bytes)
 782                                         vsllink_tap_ensure_space(0, 3);
 783                                         vsllink_tms_cmd_pos = &vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
 784                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE | 1;
 785                                         vsllink_add_path(0, num_states - (8 - vsllink_tms_data_len), path);
 786                                 }
 787                         }
 788                         else if (tms_len == 16)
 789                         {
 790                                 // end last tms shift command
 791                                 vsllink_add_path(vsllink_tms_data_len, num_states, path);
 792                         }
 793
 794                         vsllink_tms_data_len = (vsllink_tms_data_len + num_states) & 7;
 795                         if (vsllink_tms_data_len == 0)
 796                         {
 797                                 vsllink_tms_cmd_pos = NULL;
 798                         }
 799                         num_states = 0;
 800                 }
 801                 else
 802                 {
 803                         vsllink_add_path(vsllink_tms_data_len, 16 - vsllink_tms_data_len, path);
 804
 805                         path += 16 - vsllink_tms_data_len;
 806                         num_states -= 16 - vsllink_tms_data_len;
 807                         vsllink_tms_data_len = 0;
 808                         vsllink_tms_cmd_pos = NULL;
 809                 }
 810         }
 811
 812         if (num_states > 0)
 813         {
 814                 // Normal operation, don't need to append tms data
 815                 vsllink_tms_data_len = num_states & 7;
 816
 817                 while (num_states > 0)
 818                 {
 819                         if (num_states > ((VSLLINK_CMDJTAGSEQ_LENMSK + 1) * 8))
 820                         {
 821                                 i = (VSLLINK_CMDJTAGSEQ_LENMSK + 1) * 8;
 822                         }
 823                         else
 824                         {
 825                                 i = num_states;
 826                         }
 827                         tms_len = (i + 7) >> 3;
 828                         vsllink_tap_ensure_space(0, tms_len + 2);
 829                         tms_cmd_pos = vsllink_usb_out_buffer_idx;
 830                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE | (tms_len - 1);
 831
 832                         vsllink_add_path(0, i, path + path_idx);
 833
 834                         path_idx += i;
 835                         num_states -= i;
 836                 }
 837
 838                 if (vsllink_tms_data_len > 0)
 839                 {
 840                         if (tms_len < (VSLLINK_CMDJTAGSEQ_LENMSK + 1))
 841                         {
 842                                 vsllink_tms_cmd_pos = &vsllink_usb_out_buffer[tms_cmd_pos];
 843                                 (*vsllink_tms_cmd_pos)++;
 844                         }
 845                         else
 846                         {
 847                                 vsllink_usb_out_buffer[tms_cmd_pos]--;
 848
 849                                 tms_len = vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
 850                                 vsllink_tap_ensure_space(0, 3);
 851                                 vsllink_tms_cmd_pos = &vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
 852                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE | 1;
 853                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = tms_len;
 854                         }
 855                 }
 856         }
 857 }
 858 static void vsllink_path_move_dma(int num_states, tap_state_t *path)
 859 {
 860         int i, j = 0;
 861
 862         if (tap_length & 7)
 863         {
 864                 if ((8 - (tap_length & 7)) < num_states)
 865                 {
 866                         j = 8 - (tap_length & 7);
 867                 }
 868                 else
 869                 {
 870                         j = num_states;
 871                 }
 872                 for (i = 0; i < j; i++)
 873                 {
 874                         if (path[i] == tap_state_transition(tap_get_state(), false))
 875                         {
 876                                 vsllink_tap_append_step(0, 0);
 877                         }
 878                         else if (path[i] == tap_state_transition(tap_get_state(), true))
 879                         {
 880                                 vsllink_tap_append_step(1, 0);
 881                         }
 882                         else
 883                         {
 884                                 LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_name(tap_get_state()), tap_state_name(path[i]));
 885                                 exit(-1);
 886                         }
 887                         tap_set_state(path[i]);
 888                 }
 889                 num_states -= j;
 890         }
 891
 892         if (num_states > 0)
 893         {
 894                 vsllink_tap_ensure_space(0, num_states);
 895
 896                 for (i = 0; i < num_states; i++)
 897                 {
 898                         if (path[j + i] == tap_state_transition(tap_get_state(), false))
 899                         {
 900                                 vsllink_tap_append_step(0, 0);
 901                         }
 902                         else if (path[j + i] == tap_state_transition(tap_get_state(), true))
 903                         {
 904                                 vsllink_tap_append_step(1, 0);
 905                         }
 906                         else
 907                         {
 908                                 LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_name(tap_get_state()), tap_state_name(path[i]));
 909                                 exit(-1);
 910                         }
 911                         tap_set_state(path[j + i]);
 912                 }
 913         }
 914
 915         tap_set_end_state(tap_get_state());
 916 }
 917
 918 static void vsllink_stableclocks_normal(int num_cycles, int tms)
 919 {
 920         int tms_len;
 921         uint16_t tms_append_byte;
 922
 923         if (vsllink_tms_data_len > 0)
 924         {
 925                 // there are vsllink_tms_data_len more tms bits to be shifted
 926                 // so there are vsllink_tms_data_len + num_cycles tms bits in all
 927                 tms_len = vsllink_tms_data_len + num_cycles;
 928                 if (tms > 0)
 929                 {
 930                         // append '1' for tms
 931                         tms_append_byte = (uint16_t)((((1 << num_cycles) - 1) << vsllink_tms_data_len) & 0xFFFF);
 932                 }
 933                 else
 934                 {
 935                         // append '0' for tms
 936                         tms_append_byte = 0;
 937                 }
 938                 if (tms_len <= 16)
 939                 {
 940                         // merge into last tms shift
 941                         if (tms_len < 8)
 942                         {
 943                                 // just add to vsllink_tms_data_len
 944                                 // same result if tun through
 945                                 //vsllink_tms_data_len += num_cycles;
 946                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] |= (uint8_t)(tms_append_byte & 0xFF);
 947                         }
 948                         else if (tms_len == 8)
 949                         {
 950                                 // end last tms shift command
 951                                 // just reduce it, and append last tms byte
 952                                 (*vsllink_tms_cmd_pos)--;
 953                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (uint8_t)(tms_append_byte & 0xFF);
 954                         }
 955                         else if (tms_len < 16)
 956                         {
 957                                 if ((*vsllink_tms_cmd_pos & VSLLINK_CMDJTAGSEQ_LENMSK) < VSLLINK_CMDJTAGSEQ_LENMSK)
 958                                 {
 959                                         // every tms shift command can contain VSLLINK_CMDJTAGSEQ_LENMSK + 1 bytes in most
 960                                         // there is enought tms length in the current tms shift command
 961                                         // increase the tms byte length by 1 and set the last byte to 0
 962                                         (*vsllink_tms_cmd_pos)++;
 963                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (uint8_t)(tms_append_byte & 0xFF);
 964                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = (uint8_t)(tms_append_byte >> 8);
 965                                 }
 966                                 else
 967                                 {
 968                                         // every tms shift command can contain VSLLINK_CMDJTAGSEQ_LENMSK + 1 bytes in most
 969                                         // not enough tms length in the current tms shift command
 970                                         // so a new command should be added
 971                                         // first decrease byte length of last tms shift command
 972                                         (*vsllink_tms_cmd_pos)--;
 973                                         // append last tms byte and move the command pointer to the next empty position
 974                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (uint8_t)(tms_append_byte & 0xFF);
 975                                         // add new command(3 bytes)
 976                                         vsllink_tap_ensure_space(0, 3);
 977                                         vsllink_tms_cmd_pos = &vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
 978                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE | 1;
 979                                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = (uint8_t)(tms_append_byte >> 8);
 980                                 }
 981                         }
 982                         else if (tms_len == 16)
 983                         {
 984                                 // end last tms shift command
 985                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (uint8_t)(tms_append_byte & 0xFF);
 986                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (uint8_t)(tms_append_byte >> 8);
 987                         }
 988
 989                         vsllink_tms_data_len = tms_len & 7;
 990                         if (vsllink_tms_data_len == 0)
 991                         {
 992                                 vsllink_tms_cmd_pos = NULL;
 993                         }
 994                         num_cycles = 0;
 995                 }
 996                 else
 997                 {
 998                         // more shifts will be needed
 999                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= (uint8_t)(tms_append_byte & 0xFF);
1000                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (uint8_t)(tms_append_byte >> 8);
1001
1002                         num_cycles -= 16 - vsllink_tms_data_len;
1003                         vsllink_tms_data_len = 0;
1004                         vsllink_tms_cmd_pos = NULL;
1005                 }
1006         }
1007         // from here vsllink_tms_data_len == 0 or num_cycles == 0
1008
1009         if (vsllink_tms_data_len > 0)
1010         {
1011                 // num_cycles == 0
1012                 // no need to shift
1013                 if (num_cycles > 0)
1014                 {
1015                         LOG_ERROR("There MUST be some bugs in the driver");
1016                         exit(-1);
1017                 }
1018         }
1019         else
1020         {
1021                 // get number of bytes left to be sent
1022                 tms_len = num_cycles >> 3;
1023                 if (tms_len > 0)
1024                 {
1025                         vsllink_tap_ensure_space(1, 5);
1026                         // if tms_len > 0, vsllink_tms_data_len == 0
1027                         // so just add new command
1028                         // LSB of the command byte is the tms value when do the shifting
1029                         if (tms > 0)
1030                         {
1031                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSCLOCK | 1;
1032                         }
1033                         else
1034                         {
1035                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSCLOCK;
1036                         }
1037                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tms_len >> 0) & 0xff;
1038                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tms_len >> 8) & 0xff;
1039                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tms_len >> 16) & 0xff;
1040                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tms_len >> 24) & 0xff;
1041
1042                         vsllink_usb_in_want_length += 1;
1043                         pending_scan_results_buffer[pending_scan_results_length].buffer = NULL;
1044                         pending_scan_results_length++;
1045
1046                         if (tms_len > 0xFFFF)
1047                         {
1048                                 vsllink_tap_execute();
1049                         }
1050                 }
1051
1052                 // post-process
1053                 vsllink_tms_data_len = num_cycles & 7;
1054                 if (vsllink_tms_data_len > 0)
1055                 {
1056                         vsllink_tap_ensure_space(0, 3);
1057                         vsllink_tms_cmd_pos = &vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
1058                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_TMSBYTE | 1;
1059                         if (tms > 0)
1060                         {
1061                                 // append '1' for tms
1062                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = (1 << vsllink_tms_data_len) - 1;
1063                         }
1064                         else
1065                         {
1066                                 // append '0' for tms
1067                                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] = 0x00;
1068                         }
1069                 }
1070         }
1071 }
1072 static void vsllink_stableclocks_dma(int num_cycles, int tms)
1073 {
1074         int i, cur_cycles;
1075
1076         if (tap_length & 7)
1077         {
1078                 if ((8 - (tap_length & 7)) < num_cycles)
1079                 {
1080                         cur_cycles = 8 - (tap_length & 7);
1081                 }
1082                 else
1083                 {
1084                         cur_cycles = num_cycles;
1085                 }
1086                 for (i = 0; i < cur_cycles; i++)
1087                 {
1088                         vsllink_tap_append_step(tms, 0);
1089                 }
1090                 num_cycles -= cur_cycles;
1091         }
1092
1093         while (num_cycles > 0)
1094         {
1095                 if (num_cycles > 8 * tap_buffer_size)
1096                 {
1097                         cur_cycles = 8 * tap_buffer_size;
1098                 }
1099                 else
1100                 {
1101                         cur_cycles = num_cycles;
1102                 }
1103
1104                 vsllink_tap_ensure_space(0, cur_cycles);
1105
1106                 for (i = 0; i < cur_cycles; i++)
1107                 {
1108                         vsllink_tap_append_step(tms, 0);
1109                 }
1110
1111                 num_cycles -= cur_cycles;
1112         }
1113 }
1114
1115 static void vsllink_runtest(int num_cycles)
1116 {
1117         tap_state_t saved_end_state = tap_get_end_state();
1118
1119         if (tap_get_state() != TAP_IDLE)
1120         {
1121                 // enter into IDLE state
1122                 vsllink_end_state(TAP_IDLE);
1123                 vsllink_state_move();
1124         }
1125
1126         vsllink_stableclocks(num_cycles, 0);
1127
1128         // post-process
1129         // set end_state
1130         vsllink_end_state(saved_end_state);
1131         tap_set_state(TAP_IDLE);
1132         if (tap_get_end_state() != TAP_IDLE)
1133         {
1134                 vsllink_state_move();
1135         }
1136 }
1137
1138 static void vsllink_scan_normal(bool ir_scan, enum scan_type type, uint8_t *buffer, int scan_size, struct scan_command *command)
1139 {
1140         tap_state_t saved_end_state;
1141         uint8_t bits_left, tms_tmp, tdi_len;
1142         int i;
1143
1144         if (0 == scan_size)
1145         {
1146                 return;
1147         }
1148
1149         tdi_len = ((scan_size + 7) >> 3);
1150         if ((tdi_len + 7) > VSLLINK_BufferSize)
1151         {
1152                 LOG_ERROR("Your implementation of VSLLink has not enough buffer");
1153                 exit(-1);
1154         }
1155
1156         saved_end_state = tap_get_end_state();
1157
1158         /* Move to appropriate scan state */
1159         vsllink_end_state(ir_scan ? TAP_IRSHIFT : TAP_DRSHIFT);
1160
1161         if (vsllink_tms_data_len > 0)
1162         {
1163                 if (tap_get_state() == tap_get_end_state())
1164                 {
1165                         // already in IRSHIFT or DRSHIFT state
1166                         // merge tms data in the last tms shift command into next scan command
1167                         if (*vsllink_tms_cmd_pos < 1)
1168                         {
1169                                 LOG_ERROR("There MUST be some bugs in the driver");
1170                                 exit(-1);
1171                         }
1172                         else if (*vsllink_tms_cmd_pos < 2)
1173                         {
1174                                 tms_tmp = vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
1175                                 vsllink_usb_out_buffer_idx--;
1176                         }
1177                         else
1178                         {
1179                                 tms_tmp = vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx];
1180                                 *vsllink_tms_cmd_pos -= 2;
1181                         }
1182
1183                         vsllink_tap_ensure_space(1, tdi_len + 7);
1184                         // VSLLINK_CMDJTAGSEQ_SCAN ored by 1 means that tms_before is valid
1185                         // which is merged from the last tms shift command
1186                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_SCAN | 1;
1187                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = ((tdi_len + 1) >> 0) & 0xff;
1188                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = ((tdi_len + 1) >> 8) & 0xff;
1189                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = tms_tmp;
1190                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = buffer[0] << (8 - vsllink_tms_data_len);
1191
1192                         for (i = 0; i < tdi_len; i++)
1193                         {
1194                                 buffer[i] >>= 8 - vsllink_tms_data_len;
1195                                 if (i != tdi_len)
1196                                 {
1197                                         buffer[i] += buffer[i + 1] << vsllink_tms_data_len;
1198                                 }
1199                         }
1200
1201                         vsllink_tap_append_scan_normal(scan_size - vsllink_tms_data_len, buffer, command, vsllink_tms_data_len);
1202                         scan_size -= 8 - vsllink_tms_data_len;
1203                         vsllink_tms_data_len = 0;
1204                 }
1205                 else
1206                 {
1207                         vsllink_state_move();
1208                         vsllink_tap_ensure_space(1, tdi_len + 5);
1209
1210                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_SCAN;
1211                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tdi_len >> 0) & 0xff;
1212                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = (tdi_len >> 8) & 0xff;
1213
1214                         vsllink_tap_append_scan_normal(scan_size, buffer, command, 0);
1215                 }
1216         }
1217         else
1218         {
1219                 vsllink_tap_ensure_space(1, tdi_len + 7);
1220
1221                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_CMDJTAGSEQ_SCAN | 1;
1222                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = ((tdi_len + 1) >> 0) & 0xff;
1223                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = ((tdi_len + 1)>> 8) & 0xff;
1224                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_TAP_MOVE(tap_get_state(), tap_get_end_state());
1225                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 0;
1226
1227                 vsllink_tap_append_scan_normal(scan_size, buffer, command, 8);
1228         }
1229         vsllink_end_state(saved_end_state);
1230
1231         bits_left = scan_size & 0x07;
1232         tap_set_state(ir_scan ? TAP_IRPAUSE : TAP_DRPAUSE);
1233
1234         if (bits_left > 0)
1235         {
1236                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 1 << (bits_left - 1);
1237         }
1238         else
1239         {
1240                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 1 << 7;
1241         }
1242
1243         if (tap_get_state() != tap_get_end_state())
1244         {
1245                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = VSLLINK_TAP_MOVE(tap_get_state(), tap_get_end_state());
1246         }
1247         else
1248         {
1249                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 0;
1250         }
1251
1252         tap_set_state(tap_get_end_state());
1253 }
1254 static void vsllink_scan_dma(bool ir_scan, enum scan_type type, uint8_t *buffer, int scan_size, struct scan_command *command)
1255 {
1256         tap_state_t saved_end_state;
1257
1258         saved_end_state = tap_get_end_state();
1259
1260         /* Move to appropriate scan state */
1261         vsllink_end_state(ir_scan ? TAP_IRSHIFT : TAP_DRSHIFT);
1262
1263         vsllink_state_move();
1264         vsllink_end_state(saved_end_state);
1265
1266         /* Scan */
1267         vsllink_tap_append_scan_dma(scan_size, buffer, command);
1268
1269         tap_set_state(ir_scan ? TAP_IRPAUSE : TAP_DRPAUSE);
1270         while (tap_length % 8 != 0)
1271         {
1272                 // more 0s in Pause
1273                 vsllink_tap_append_step(0, 0);
1274         }
1275
1276         if (tap_get_state() != tap_get_end_state())
1277         {
1278                 vsllink_state_move();
1279         }
1280 }
1281
1282 static void vsllink_reset(int trst, int srst)
1283 {
1284         int result;
1285
1286         LOG_DEBUG("trst: %i, srst: %i", trst, srst);
1287
1288         /* Signals are active low */
1289         vsllink_usb_out_buffer[0] = VSLLINK_CMD_SET_PORT;
1290         vsllink_usb_out_buffer[1] = JTAG_PINMSK_SRST | JTAG_PINMSK_TRST;
1291         vsllink_usb_out_buffer[2] = 0;
1292         if (srst == 0)
1293         {
1294                 vsllink_usb_out_buffer[2] |= JTAG_PINMSK_SRST;
1295         }
1296         if (trst == 0)
1297         {
1298                 vsllink_usb_out_buffer[2] |= JTAG_PINMSK_TRST;
1299         }
1300
1301         result = vsllink_usb_write(vsllink_handle, 3);
1302         if (result != 3)
1303         {
1304                 LOG_ERROR("VSLLink command VSLLINK_CMD_SET_PORT failed (%d)", result);
1305         }
1306 }
1307
1308 static void vsllink_simple_command(uint8_t command)
1309 {
1310         int result;
1311
1312         DEBUG_JTAG_IO("0x%02x", command);
1313
1314         vsllink_usb_out_buffer[0] = command;
1315         result = vsllink_usb_write(vsllink_handle, 1);
1316
1317         if (result != 1)
1318         {
1319                 LOG_ERROR("VSLLink command 0x%02x failed (%d)", command, result);
1320         }
1321 }
1322
1323 COMMAND_HANDLER(vsllink_handle_mode_command)
1324 {
1325         if (CMD_ARGC != 1) {
1326                 LOG_ERROR("parameter error, should be one parameter for VID");
1327                 return ERROR_FAIL;
1328         }
1329
1330         if (!strcmp(CMD_ARGV[0], "normal"))
1331         {
1332                 vsllink_mode = VSLLINK_MODE_NORMAL;
1333         }
1334         else if (!strcmp(CMD_ARGV[0], "dma"))
1335         {
1336                 vsllink_mode = VSLLINK_MODE_DMA;
1337         }
1338         else
1339         {
1340                 LOG_ERROR("invalid vsllink_mode: %s", CMD_ARGV[0]);
1341                 return ERROR_FAIL;
1342         }
1343
1344         return ERROR_OK;
1345 }
1346
1347 COMMAND_HANDLER(vsllink_handle_usb_vid_command)
1348 {
1349         if (CMD_ARGC != 1)
1350         {
1351                 LOG_ERROR("parameter error, should be one parameter for VID");
1352                 return ERROR_OK;
1353         }
1354
1355         COMMAND_PARSE_NUMBER(u16, CMD_ARGV[0], vsllink_usb_vid);
1356         return ERROR_OK;
1357 }
1358
1359 COMMAND_HANDLER(vsllink_handle_usb_pid_command)
1360 {
1361         if (CMD_ARGC != 1)
1362         {
1363                 LOG_ERROR("parameter error, should be one parameter for PID");
1364                 return ERROR_OK;
1365         }
1366         COMMAND_PARSE_NUMBER(u16, CMD_ARGV[0], vsllink_usb_pid);
1367         return ERROR_OK;
1368 }
1369
1370 COMMAND_HANDLER(vsllink_handle_usb_bulkin_command)
1371 {
1372         if (CMD_ARGC != 1)
1373         {
1374                 LOG_ERROR("parameter error, should be one parameter for BULKIN endpoint");
1375                 return ERROR_OK;
1376         }
1377
1378         COMMAND_PARSE_NUMBER(u8, CMD_ARGV[0], vsllink_usb_bulkin);
1379
1380         vsllink_usb_bulkin |= 0x80;
1381
1382         return ERROR_OK;
1383 }
1384
1385 COMMAND_HANDLER(vsllink_handle_usb_bulkout_command)
1386 {
1387         if (CMD_ARGC != 1)
1388         {
1389                 LOG_ERROR("parameter error, should be one parameter for BULKOUT endpoint");
1390                 return ERROR_OK;
1391         }
1392
1393         COMMAND_PARSE_NUMBER(u8, CMD_ARGV[0], vsllink_usb_bulkout);
1394
1395         vsllink_usb_bulkout &= ~0x80;
1396
1397         return ERROR_OK;
1398 }
1399
1400 COMMAND_HANDLER(vsllink_handle_usb_interface_command)
1401 {
1402         if (CMD_ARGC != 1)
1403         {
1404                 LOG_ERROR("parameter error, should be one parameter for interface number");
1405                 return ERROR_OK;
1406         }
1407
1408         COMMAND_PARSE_NUMBER(u8, CMD_ARGV[0], vsllink_usb_interface);
1409         return ERROR_OK;
1410 }
1411
1412 /***************************************************************************/
1413 /* VSLLink tap functions */
1414
1415 static void vsllink_tap_init_normal(void)
1416 {
1417         vsllink_usb_out_buffer_idx = 0;
1418         vsllink_usb_in_want_length = 0;
1419         pending_scan_results_length = 0;
1420 }
1421 static void vsllink_tap_init_dma(void)
1422 {
1423         tap_length = 0;
1424         pending_scan_results_length = 0;
1425 }
1426
1427 static void vsllink_tap_ensure_space_normal(int scans, int length)
1428 {
1429         int available_scans = MAX_PENDING_SCAN_RESULTS - pending_scan_results_length;
1430         int available_bytes = VSLLINK_BufferSize - vsllink_usb_out_buffer_idx;
1431
1432         if (scans > available_scans || length > available_bytes)
1433         {
1434                 vsllink_tap_execute();
1435         }
1436 }
1437 static void vsllink_tap_ensure_space_dma(int scans, int length)
1438 {
1439         int available_scans = MAX_PENDING_SCAN_RESULTS - pending_scan_results_length;
1440         int available_bytes = tap_buffer_size * 8 - tap_length;
1441
1442         if (scans > available_scans || length > available_bytes)
1443         {
1444                 vsllink_tap_execute();
1445         }
1446 }
1447
1448 static void vsllink_tap_append_step(int tms, int tdi)
1449 {
1450         last_tms = tms;
1451         int index = tap_length / 8;
1452
1453         if (index < tap_buffer_size)
1454         {
1455                 int bit_index = tap_length % 8;
1456                 uint8_t bit = 1 << bit_index;
1457
1458                 if (tms)
1459                 {
1460                         tms_buffer[index] |= bit;
1461                 }
1462                 else
1463                 {
1464                         tms_buffer[index] &= ~bit;
1465                 }
1466
1467                 if (tdi)
1468                 {
1469                         tdi_buffer[index] |= bit;
1470                 }
1471                 else
1472                 {
1473                         tdi_buffer[index] &= ~bit;
1474                 }
1475
1476                 tap_length++;
1477         }
1478         else
1479         {
1480                 LOG_ERROR("buffer overflow, tap_length=%d", tap_length);
1481         }
1482 }
1483
1484 static void vsllink_tap_append_scan_normal(int length, uint8_t *buffer, struct scan_command *command, int offset)
1485 {
1486         struct pending_scan_result *pending_scan_result = &pending_scan_results_buffer[pending_scan_results_length];
1487         int i;
1488
1489         if (offset > 0)
1490         {
1491                 vsllink_usb_in_want_length += ((length + 7) >> 3) + 1;
1492         }
1493         else
1494         {
1495                 vsllink_usb_in_want_length += (length + 7) >> 3;
1496         }
1497         pending_scan_result->length = length;
1498         pending_scan_result->offset = offset;
1499         pending_scan_result->command = command;
1500         pending_scan_result->buffer = buffer;
1501
1502         for (i = 0; i < ((length + 7) >> 3); i++)
1503         {
1504                 vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = buffer[i];
1505         }
1506
1507         pending_scan_results_length++;
1508 }
1509 static void vsllink_tap_append_scan_dma(int length, uint8_t *buffer, struct scan_command *command)
1510 {
1511         struct pending_scan_result *pending_scan_result;
1512         int len_tmp, len_all, i;
1513
1514         len_all = 0;
1515         while (len_all < length)
1516         {
1517                 if ((length - len_all) > tap_buffer_size * 8)
1518                 {
1519                         len_tmp = tap_buffer_size * 8;
1520                 }
1521                 else
1522                 {
1523                         len_tmp = length - len_all;
1524                 }
1525
1526                 vsllink_tap_ensure_space(1, (len_tmp + 7) & ~7);
1527
1528                 pending_scan_result = &pending_scan_results_buffer[pending_scan_results_length];
1529                 pending_scan_result->offset = tap_length;
1530                 pending_scan_result->length = len_tmp;
1531                 pending_scan_result->command = command;
1532                 pending_scan_result->buffer = buffer + len_all / 8;
1533
1534                 for (i = 0; i < len_tmp; i++)
1535                 {
1536                         vsllink_tap_append_step(((len_all + i) < length-1 ? 0 : 1), (buffer[(len_all + i)/8] >> ((len_all + i)%8)) & 1);
1537                 }
1538
1539                 pending_scan_results_length++;
1540                 len_all += len_tmp;
1541         }
1542 }
1543
1544 /* Pad and send a tap sequence to the device, and receive the answer.
1545  * For the purpose of padding we assume that we are in reset or idle or pause state. */
1546 static int vsllink_tap_execute_normal(void)
1547 {
1548         int i;
1549         int result;
1550         int first = 0;
1551
1552         if (vsllink_tms_data_len > 0)
1553         {
1554                 if ((tap_get_state() != TAP_RESET) && (tap_get_state() != TAP_IDLE) && (tap_get_state() != TAP_IRPAUSE) && (tap_get_state() != TAP_DRPAUSE))
1555                 {
1556                         LOG_WARNING("%s is not in RESET or IDLE or PAUSR state", tap_state_name(tap_get_state()));
1557                 }
1558
1559                 if (vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx] & (1 << (vsllink_tms_data_len - 1)))
1560                 {
1561                         // last tms bit is '1'
1562                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] |= 0xFF << vsllink_tms_data_len;
1563                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 0xFF;
1564                         vsllink_tms_data_len = 0;
1565                 }
1566                 else
1567                 {
1568                         // last tms bit is '0'
1569                         vsllink_usb_out_buffer_idx++;
1570                         vsllink_usb_out_buffer[vsllink_usb_out_buffer_idx++] = 0;
1571                         vsllink_tms_data_len = 0;
1572                 }
1573         }
1574
1575         if (vsllink_usb_out_buffer_idx > 3)
1576         {
1577                 if (vsllink_usb_out_buffer[0] == VSLLINK_CMD_HW_JTAGSEQCMD)
1578                 {
1579                         vsllink_usb_out_buffer[1] = (vsllink_usb_out_buffer_idx >> 0) & 0xff;
1580                         vsllink_usb_out_buffer[2] = (vsllink_usb_out_buffer_idx >> 8) & 0xff;
1581                 }
1582
1583                 result = vsllink_usb_message(vsllink_handle, vsllink_usb_out_buffer_idx, vsllink_usb_in_want_length);
1584
1585                 if (result == vsllink_usb_in_want_length)
1586                 {
1587                         for (i = 0; i < pending_scan_results_length; i++)
1588                         {
1589                                 struct pending_scan_result *pending_scan_result = &pending_scan_results_buffer[i];
1590                                 uint8_t *buffer = pending_scan_result->buffer;
1591                                 int length = pending_scan_result->length;
1592                                 int offset = pending_scan_result->offset;
1593                                 struct scan_command *command = pending_scan_result->command;
1594
1595                                 if (buffer != NULL)
1596                                 {
1597                                         // IRSHIFT or DRSHIFT
1598                                         buf_set_buf(vsllink_usb_in_buffer, first * 8 + offset, buffer, 0, length);
1599                                         first += (length + offset + 7) >> 3;
1600
1601                                         DEBUG_JTAG_IO("JTAG scan read(%d bits):", length);
1602 #ifdef _DEBUG_JTAG_IO_
1603                                         vsllink_debug_buffer(buffer, (length + 7) >> 3);
1604 #endif
1605
1606                                         if (jtag_read_buffer(buffer, command) != ERROR_OK)
1607                                         {
1608                                                 vsllink_tap_init();
1609                                                 return ERROR_JTAG_QUEUE_FAILED;
1610                                         }
1611
1612                                         free(pending_scan_result->buffer);
1613                                         pending_scan_result->buffer = NULL;
1614                                 }
1615                                 else
1616                                 {
1617                                         first++;
1618                                 }
1619                         }
1620                 }
1621                 else
1622                 {
1623                         LOG_ERROR("vsllink_tap_execute, wrong result %d, expected %d", result, vsllink_usb_in_want_length);
1624                         return ERROR_JTAG_QUEUE_FAILED;
1625                 }
1626
1627                 vsllink_tap_init();
1628         }
1629         reset_command_pointer();
1630
1631         return ERROR_OK;
1632 }
1633 static int vsllink_tap_execute_dma(void)
1634 {
1635         int byte_length;
1636         int i;
1637         int result;
1638
1639         if (tap_length > 0)
1640         {
1641                 /* Pad last byte so that tap_length is divisible by 8 */
1642                 while (tap_length % 8 != 0)
1643                 {
1644                         /* More of the last TMS value keeps us in the same state,
1645                          * analogous to free-running JTAG interfaces. */
1646                         vsllink_tap_append_step(last_tms, 0);
1647                 }
1648                 byte_length = tap_length / 8;
1649
1650                 vsllink_usb_out_buffer[0] = VSLLINK_CMD_HW_JTAGRAWCMD;
1651                 vsllink_usb_out_buffer[1] = ((byte_length * 2 + 3) >> 0) & 0xff;                // package size
1652                 vsllink_usb_out_buffer[2] = ((byte_length * 2 + 3) >> 8) & 0xff;
1653
1654                 memcpy(&vsllink_usb_out_buffer[3], tdi_buffer, byte_length);
1655                 memcpy(&vsllink_usb_out_buffer[3 + byte_length], tms_buffer, byte_length);
1656
1657                 result = vsllink_usb_message(vsllink_handle, 3 + 2 * byte_length, byte_length);
1658                 if (result == byte_length)
1659                 {
1660                         for (i = 0; i < pending_scan_results_length; i++)
1661                         {
1662                                 struct pending_scan_result *pending_scan_result = &pending_scan_results_buffer[i];
1663                                 uint8_t *buffer = pending_scan_result->buffer;
1664                                 int length = pending_scan_result->length;
1665                                 int first = pending_scan_result->offset;
1666
1667                                 struct scan_command *command = pending_scan_result->command;
1668                                 buf_set_buf(vsllink_usb_in_buffer, first, buffer, 0, length);
1669
1670                                 DEBUG_JTAG_IO("JTAG scan read(%d bits, from %d bits):", length, first);
1671 #ifdef _DEBUG_JTAG_IO_
1672                                 vsllink_debug_buffer(buffer, (length + 7) >> 3);
1673 #endif
1674
1675                                 if (jtag_read_buffer(buffer, command) != ERROR_OK)
1676                                 {
1677                                         vsllink_tap_init();
1678                                         return ERROR_JTAG_QUEUE_FAILED;
1679                                 }
1680
1681                                 if (pending_scan_result->buffer != NULL)
1682                                 {
1683                                         free(pending_scan_result->buffer);
1684                                 }
1685                         }
1686                 }
1687                 else
1688                 {
1689                         LOG_ERROR("vsllink_tap_execute, wrong result %d, expected %d", result, byte_length);
1690                         return ERROR_JTAG_QUEUE_FAILED;
1691                 }
1692
1693                 vsllink_tap_init();
1694         }
1695
1696         return ERROR_OK;
1697 }
1698
1699 /*****************************************************************************/
1700 /* VSLLink USB low-level functions */
1701
1702 static struct vsllink* vsllink_usb_open(void)
1703 {
1704         usb_init();
1705
1706         const uint16_t vids[] = { vsllink_usb_vid, 0 };
1707         const uint16_t pids[] = { vsllink_usb_pid, 0 };
1708         struct usb_dev_handle *dev;
1709         if (jtag_usb_open(vids, pids, &dev) != ERROR_OK)
1710                 return NULL;
1711
1712         /* usb_set_configuration required under win32 */
1713         struct usb_device *udev = usb_device(dev);
1714         int ret = usb_set_configuration(dev, udev->config[0].bConfigurationValue);
1715         if (ret != 0)
1716         {
1717                 LOG_ERROR("fail to set configuration to %d (error %d)."
1718                                 "Not enough permissions for the device?",
1719                                 udev->config[0].bConfigurationValue, ret);
1720                 return NULL;
1721         }
1722         ret = usb_claim_interface(dev, vsllink_usb_interface);
1723         if (ret != 0)
1724         {
1725                 LOG_ERROR("fail to claim interface %d, %d returned",
1726                                 vsllink_usb_interface, ret);
1727                 return NULL;
1728         }
1729 #if 0
1730         /*
1731         * This makes problems under Mac OS X. And is not needed
1732         * under Windows. Hopefully this will not break a linux build
1733         */
1734         usb_set_altinterface(dev, 0);
1735 #endif
1736
1737         struct vsllink *result = malloc(sizeof(struct vsllink));
1738         result->usb_handle = dev;
1739         return result;
1740 }
1741
1742 static void vsllink_usb_close(struct vsllink *vsllink)
1743 {
1744         int ret;
1745
1746         ret = usb_release_interface(vsllink->usb_handle, vsllink_usb_interface);
1747         if (ret != 0)
1748         {
1749                 LOG_ERROR("fail to release interface %d, %d returned", vsllink_usb_interface, ret);
1750                 exit(-1);
1751         }
1752
1753         ret = usb_close(vsllink->usb_handle);
1754         if (ret != 0)
1755         {
1756                 LOG_ERROR("fail to close usb, %d returned", ret);
1757                 exit(-1);
1758         }
1759
1760         free(vsllink);
1761 }
1762
1763 /* Send a message and receive the reply. */
1764 static int vsllink_usb_message(struct vsllink *vsllink, int out_length, int in_length)
1765 {
1766         int result;
1767
1768         result = vsllink_usb_write(vsllink, out_length);
1769         if (result == out_length)
1770         {
1771                 if (in_length > 0)
1772                 {
1773                         result = vsllink_usb_read(vsllink);
1774                         if (result == in_length)
1775                         {
1776                                 return result;
1777                         }
1778                         else
1779                         {
1780                                 LOG_ERROR("usb_bulk_read failed (requested=%d, result=%d)", in_length, result);
1781                                 return -1;
1782                         }
1783                 }
1784                 return 0;
1785         }
1786         else
1787         {
1788                 LOG_ERROR("usb_bulk_write failed (requested=%d, result=%d)", out_length, result);
1789                 return -1;
1790         }
1791 }
1792
1793 /* Write data from out_buffer to USB. */
1794 static int vsllink_usb_write(struct vsllink *vsllink, int out_length)
1795 {
1796         int result;
1797
1798         if (out_length > VSLLINK_BufferSize)
1799         {
1800                 LOG_ERROR("vsllink_write illegal out_length=%d (max=%d)", out_length, VSLLINK_BufferSize);
1801                 return -1;
1802         }
1803
1804         result = usb_bulk_write(vsllink->usb_handle, vsllink_usb_bulkout, \
1805                 (char *)vsllink_usb_out_buffer, out_length, VSLLINK_USB_TIMEOUT);
1806
1807         DEBUG_JTAG_IO("vsllink_usb_write, out_length = %d, result = %d", out_length, result);
1808
1809 #ifdef _DEBUG_USB_COMMS_
1810         LOG_DEBUG("USB out:");
1811         vsllink_debug_buffer(vsllink_usb_out_buffer, out_length);
1812 #endif
1813
1814 #ifdef _VSLLINK_IN_DEBUG_MODE_
1815         usleep(100000);
1816 #endif
1817
1818         return result;
1819 }
1820
1821 /* Read data from USB into in_buffer. */
1822 static int vsllink_usb_read(struct vsllink *vsllink)
1823 {
1824         int result = usb_bulk_read(vsllink->usb_handle, vsllink_usb_bulkin, \
1825                 (char *)vsllink_usb_in_buffer, VSLLINK_BufferSize, VSLLINK_USB_TIMEOUT);
1826
1827         DEBUG_JTAG_IO("vsllink_usb_read, result = %d", result);
1828
1829 #ifdef _DEBUG_USB_COMMS_
1830         LOG_DEBUG("USB in:");
1831         vsllink_debug_buffer(vsllink_usb_in_buffer, result);
1832 #endif
1833         return result;
1834 }
1835
1836 #define BYTES_PER_LINE  16
1837
1838 #if defined _DEBUG_USB_COMMS_ || defined _DEBUG_JTAG_IO_
1839 static void vsllink_debug_buffer(uint8_t *buffer, int length)
1840 {
1841         char line[81];
1842         char s[4];
1843         int i;
1844         int j;
1845
1846         for (i = 0; i < length; i += BYTES_PER_LINE)
1847         {
1848                 snprintf(line, 5, "%04x", i);
1849                 for (j = i; j < i + BYTES_PER_LINE && j < length; j++)
1850                 {
1851                         snprintf(s, 4, " %02x", buffer[j]);
1852                         strcat(line, s);
1853                 }
1854                 LOG_DEBUG("%s", line);
1855         }
1856 }
1857 #endif // _DEBUG_USB_COMMS_ || _DEBUG_JTAG_IO_
1858
1859 static int vsllink_register_commands(struct command_context *cmd_ctx)
1860 {
1861         register_command(cmd_ctx, NULL, "vsllink_usb_vid",
1862                         vsllink_handle_usb_vid_command, COMMAND_CONFIG,
1863                         NULL);
1864         register_command(cmd_ctx, NULL, "vsllink_usb_pid",
1865                         vsllink_handle_usb_pid_command, COMMAND_CONFIG,
1866                         NULL);
1867         register_command(cmd_ctx, NULL, "vsllink_usb_bulkin",
1868                         vsllink_handle_usb_bulkin_command, COMMAND_CONFIG,
1869                         NULL);
1870         register_command(cmd_ctx, NULL, "vsllink_usb_bulkout",
1871                         vsllink_handle_usb_bulkout_command, COMMAND_CONFIG,
1872                         NULL);
1873         register_command(cmd_ctx, NULL, "vsllink_usb_interface",
1874                         vsllink_handle_usb_interface_command, COMMAND_CONFIG,
1875                         NULL);
1876         register_command(cmd_ctx, NULL, "vsllink_mode",
1877                         vsllink_handle_mode_command, COMMAND_CONFIG,
1878                         NULL);
1879
1880         return ERROR_OK;
1881 }
1882
1883 struct jtag_interface vsllink_interface = {
1884                 .name = "vsllink",
1885                 .register_commands = &vsllink_register_commands,
1886                 .init = &vsllink_init,
1887                 .quit = &vsllink_quit,
1888                 .khz = &vsllink_khz,
1889                 .speed = &vsllink_speed,
1890                 .speed_div = &vsllink_speed_div,
1891                 .execute_queue = &vsllink_execute_queue,
1892         };